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作为建筑地基使用的泰山片麻岩,埋藏浅、区域特征明显,其风化特性对土木工程稳定性的影响广泛而复杂。应力-应变关系实验发现,5组片麻岩试件的A、B、C-D和E组分别隶属于未风化、中等风化、强风化和全风化4种风化程度。力学性质实验时同步检测不同风化程度片麻岩的声发射信号,发现随片麻岩风化程度的提高,振铃计数率呈明显下降趋势;未风化及中等风化片麻岩的振铃计数率最高可达2500次/S,具有能量累积并集中释放的特点,岩石脆性特征较明显;强风化片麻岩的振铃计数率平均约200次/S,声发射信号密集,岩石具有典型的延性特征;全风化片麻岩的平均振铃计数率仅约15次/S,声发射信号离散、无规律,岩石已等同于散体介质;得到了部分片麻岩风化程度与声发射之间的量化规律。建立的片麻岩风化程度与声发射关系,可应用于指导风化片麻岩地基的处理,寻求匹配的地基置换材料。
The Taishan gneiss, used as the foundation of construction, has shallow burial and obvious regional characteristics. Its weathering characteristics have a wide and complicated impact on the stability of civil engineering. According to the experiment of stress-strain relationship, we found that the A, B, C-D and E groups of five gneiss samples belong to four degrees of weathered, moderately weathered, strongly weathered and fully weathered, respectively. Mechanical properties The acoustic emission signals of gneiss with different degree of weathering were detected synchronously in the experiment. It was found that the count rate of ringing ring decreased obviously with the increase of gneiss weathering degree. The highest ring counting rate of unweathered and medium weathered gneiss was observed Up to 2500 times / s, with the characteristics of energy accumulation and concentrated release. The rock brittleness characteristics are obvious. The counting rate of strong weathered gneiss is about 200 times / S on average, the acoustic emission signals are dense and the rock has the typical ductile characteristics The average ringing count rate of fully gneissic gneiss is only about 15 times / s, the acoustic emission signals are discrete and irregular, and the rock has been equated with the bulk medium. The quantification of the degree of weathering of some gneiss and acoustic emission law. The established degree of gneiss weathering and acoustic emission relationship, can be used to guide the treatment of weathered gneiss foundation, to find a matching foundation replacement material.